Re: Misplacing components

On 4/24/2024 9:33 AM, Zen Cycle wrote:

On 4/24/2024 10:19 AM, Roger Merriman wrote:

AMuzi <am@yellowjersey.org> wrote:

On 4/24/2024 4:29 AM, Roger Merriman wrote:

Frank Krygowski <frkrygow@sbcglobal.net> wrote:

On 4/23/2024 7:36 PM, Roger Merriman wrote:

Frank Krygowski <frkrygow@sbcglobal.net> wrote:

... I'm pretty sure I still have the Huret Svelto derailleur that was
original equipment on my first ever ten speed - back when "ten speed"
meant 5x2.
>

My first road bike was that as well it was old at that point, Suntour in
this case, I did upgrade it to modern 10s mainly it was massively over
geared particularly for someone who rides around Wales from time to time!
>
But old derailleurs seem to last, seem to remember the shifting was about
the same both systems using down tube shifters, though rear was indexed for
the modern one, but front was left friction.

>
I rode with that Svelto for a few years. One of my first little bike
splurges (when we had very little extra money) was to change to SunTour
rear derailleurs. The difference in shifting was enormous. And the
SunTours also allowed bigger rear cogs, especially helpful for my wife.
>
I suspect the Svelto would now shift as well as it ever did. I do think
old derailleurs last a long time.
>

If the spring has got tired maybe be a bit slower, I did have one that for
that reason ie it shifted but really quite slowly, that I replaced it with
a new derailleur 9s being so cheap.
>
But yes they seem to last and for road bikes not much technology
advancement over last few decades, different to MTB/Gravel which have
clutches and what not.
>
Roger Merriman
>

>
In theory, calculating spring degradation over cycles is
extremely complex but in practice, within a human lifetime,
derailleur springs do not noticeably degrade*.
>
Pivots can become encrusted, rusty, worn, bent and broken
such that the spring can no longer move them as smartly but
that's not a change in the spring itself.
>
*else my vintage automatic Swiss watches would have died
long ago after many millions of cycles. The 1960 Rado on my
wrist today keeps perfect time.

>
The rear mech 9s Deore on the old MTB did become slow, was perfectly in
tune etc just slow to respond it had though done 10 years climbing the
Welsh hills and what not before retirement to plodding across West London.
>
Certainly a new mech even of a lower grade seemed to bring the shifting
back to normal.
>
Roger Merriman
>

 I'm thinking that isn't the spring as much as it is the pivots

Exactly. Springs do not 'wear out' or 'go soft' when used within designed load/range limits to any measurable degree.
--
Andrew Muzi
am@yellowjersey.org
Open every day since 1 April, 1971